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<a name="boost_regex.syntax"></a><a class="link" href="syntax.html" title="Regular Expression Syntax">Regular Expression Syntax</a>
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<div class="toc"><dl class="toc">
<dt><span class="section"><a href="syntax/perl_syntax.html">Perl Regular Expression
      Syntax</a></span></dt>
<dt><span class="section"><a href="syntax/basic_extended.html">POSIX Extended Regular
      Expression Syntax</a></span></dt>
<dt><span class="section"><a href="syntax/basic_syntax.html">POSIX Basic Regular
      Expression Syntax</a></span></dt>
<dt><span class="section"><a href="syntax/character_classes.html">Character Class
      Names</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="syntax/character_classes/std_char_classes.html">Character
        Classes that are Always Supported</a></span></dt>
<dt><span class="section"><a href="syntax/character_classes/optional_char_class_names.html">Character
        classes that are supported by Unicode Regular Expressions</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="syntax/collating_names.html">Collating Names</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="syntax/collating_names/digraphs.html">Digraphs</a></span></dt>
<dt><span class="section"><a href="syntax/collating_names/posix_symbolic_names.html">POSIX
        Symbolic Names</a></span></dt>
<dt><span class="section"><a href="syntax/collating_names/named_unicode.html">Named
        Unicode Characters</a></span></dt>
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<dt><span class="section"><a href="syntax/leftmost_longest_rule.html">The Leftmost
      Longest Rule</a></span></dt>
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<p>
      This section covers the regular expression syntax used by this library, this
      is a programmers guide, the actual syntax presented to your program's users
      will depend upon the flags used during expression compilation.
    </p>
<p>
      There are three main syntax options available, depending upon how you construct
      the regular expression object:
    </p>
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<li class="listitem">
          <a class="link" href="syntax/perl_syntax.html" title="Perl Regular Expression Syntax">Perl (this is the default
          behavior)</a>.
        </li>
<li class="listitem">
          <a class="link" href="syntax/basic_extended.html" title="POSIX Extended Regular Expression Syntax">POSIX extended (including
          the egrep and awk variations)</a>.
        </li>
<li class="listitem">
          <a class="link" href="syntax/basic_syntax.html" title="POSIX Basic Regular Expression Syntax">POSIX Basic (including
          the grep and emacs variations)</a>.
        </li>
</ul></div>
<p>
      You can also construct a regular expression that treats every character as
      a literal, but that's not really a "syntax"!
    </p>
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        Distributed under the Boost Software License, Version 1.0. (See accompanying
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